I think the inner consistency you are missing is that operands aren't only values, they can be operations as well. The left = (the scalar assignment) has as its right operand not the "result of [the list] assignment", but rather the list assigment operation. And that operation, by virtue of being the right side of a scalar assignment, gets scalar context, and the "result" of a list assignment in scalar context is the number of elements on the right of the assignment. Does that help at all?
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